Over at the Steam Forums, user by the name StickZero has apparently found something really very interesting. He’s found some assets in the Alien Swarm SDK that points towards growing evidence that Half Life 2: Episode 3 is in development. If you open the Alien Swarm SDK, place an info_node_hint and check the hint options you will see Aperture Nest, Blob Brain etc. Take this with a pinch of salt, but this may well be the proof Half Life fans have been waiting for to show that Episode 3 is indeed in development.
Check the image below, courtesy dl.dropbox.com.
Click the image to see it in full screen:
